Distance

Flow

acre-ft/day - flow that would cover a perfectly flat acre of land one-foot deep in one day acre-in/day - flow that would cover a perfectly flat acre of land one-inch deep in one day acre-in/hr - flow that would cover a perfectly flat acre of land one-inch deep in one hour. This is approximately equal to 1 cfs. cfs - cubic feet per second. There are about 450 gpm in 1 cfs. 1 cfs is about 1 acre-in/hr. In other words 1 cfs will cover 1 acre in 2 feet of water in one day. cfm - cubic feet per minute cms - cubic meters per second (1 cms is a lot of water! About 16,000 gpm.) cu. m/hr - cubic meters per hour cu. yd/min - cubic yards per minute gpd - gallons per day gph - gallons per hour. Typically used for drip emitter flow rates. gpm - gallons per minute mgd - million gallons per day lph - liters per hour lpm - liters per minute lps - metric liters per second. 1 lps is about 16 gallons per minute. Return to top

Power

Precipitation

cfs/acre - cubic feet per second per acre cm/day - centimeters per day cm/hr - centimeters per hour cm/month - centimeters per month cms/ha - cubic meters per second per hectare gpm/acre - gallons per minute per acre. This is commonly used to design irrigation systems. 7 gpm/acre is a common design number for Eastern Washington. in/day - inches per day in/hr - inches per hour. This is a common measurement of an irrigation system's application rate. It is important to know to understand how long to leave the irrigation system on. in/month - inches per month lps/ha - liters per second per hectare

Pressure

atm - Atmospheres. Equal to about 14.7 pounds per square inch.

bars - 1 bar is 100 kilopascals of pressure. ft of water - Feet of water. Also known as feet of head. The pressure at the bottom of the given depth of water in feet. Used by engineers to design systems. About 2.3 feet of water is equivalent to 1 psi. in of Mercury - Inches of mercury. Pressure at the bottom of the given depth of mercury in inches.

in of water - Inches of water. Pressure at the bottom of the given depth of water in inches. kPa - Kilopascals. 1000 pascals. 1 pascal = the force of 1 newton on 1 square meter. m of water - meters of water. The pressure at the bottom of the given depth of water in meters. 1 m of water is about 9.8 kPa. psi - pounds per square inch. Sometimes referred to colloquially as "pounds of pressure". Return to top

Salinity

dS/m - deci-siemens per meter. A measurement of electrical conductivity (EC). Salty water conducts electricity more readily than pure water. Therefore as salinity increases, EC increases. microS/cm - micro-siemens per centimeter mg/l - milligrams of dissolved salt per liter of liquid. A measurement of total dissolved solids(TBS) equivalent to parts per million (ppm). mS/cm - milli-siemens per centimeter ppm - parts per million. Parts of salt per million parts of the total solution. Equivalent to milligrams per liter. tons/acre-ft - tons of salt per acre-foot of water Return to top

Volume

acre-ft - amount of water that would cover a perfectly flat acre of land one-foot deep acre-in - amount of water that would cover a perfectly flat acre of land one-inch deep cu. ft. - cubic foot of water

cu. in - cub inches

cu. meter - cubic meters

cu. yd - cubic yards

gals - gallons

gal UK - United Kingdom (UK) gallons

hectare - mm - Amount of water that would cover a perfectly flat hectare that is one millimeter deep.

hectare - m - Amount of water that would cover a perfectly flat hectare that is one meter deep.